Raypak introduces the XPak modulating, condensing wall-hung boiler in model sizes 85 and 120. The XPak achieves 92.6% thermal efficiency at full fire. Certified for CPVC, polypropylene and SS venting. Direct vent ready, install as concentric vent or twin penetration for total job site flexibility. Other features include modulation with 5:1 turn down, synchronized with a three-speed SS nonferrous pump. The unit is built with an innovative, state-of-the-art extruded aluminum heat exchanger, ASME H stamp.